re PR c++/55249 (Multiple copy constructors for template class lead to link errors)

	PR c++/55249
	* tree.c (build_vec_init_elt): Use the type of the initializer.

From-SVN: r194281

gcc/cp/ChangeLog

 2012-12-06  Jason Merrill  <jason@redhat.com>
 
+	PR c++/55249
+	* tree.c (build_vec_init_elt): Use the type of the initializer.
+
 	PR c++/54744
 	* pt.c (resolve_typename_type): Check TYPENAME_IS_RESOLVING_P on scope.
 	* init.c (expand_member_init): Check for being in a template first.

gcc/cp/tree.c

@@ -524,7 +524,8 @@ build_vec_init_elt (tree type, tree init, tsubst_flags_t complain)
   argvec = make_tree_vector ();
   if (init)
     {
-      tree dummy = build_dummy_object (inner_type);
+      tree init_type = strip_array_types (TREE_TYPE (init));
+      tree dummy = build_dummy_object (init_type);
       if (!real_lvalue_p (init))
 	dummy = move (dummy);
       argvec->quick_push (dummy);

gcc/testsuite/g++.dg/template/array25.C

+// PR c++/55249
+
+template <typename _Tp> struct A
+{
+  _Tp _M_instance[1];
+};
+template <class> struct inner_type
+{
+    inner_type () {}
+    inner_type (inner_type &);
+    inner_type (const inner_type &) {}
+};
+
+int
+main ()
+{
+    A <inner_type <int> > a, b = a;
+}